Which of the following BEST describes a Change Authority?

The Change Advisory Board is only one specific instance of a Change Authority; defining it solely as the CAB is too narrow and excludes other valid authorization structures such as individual approvers or automated processes.

This option is incomplete because it restricts Change Authority to a single person, omitting that it can also be a defined role or a group of people such as the CAB.

ITIL defines a Change Authority as a role, person, or group of people that provides formal authorization for a particular type of change, reflecting that different change types require different levels and structures of approval. This broad definition allows organizations to assign appropriate authorities at various levels - from an individual manager authorizing standard changes to a full Change Advisory Board evaluating major changes. It avoids prescribing a single authority for all change types.

The Change Manager is one possible Change Authority for certain change types, but restricting the definition solely to the Change Manager excludes other legitimate authorities and does not reflect ITIL's broader definition.